Hollis - DG03

Hollis - DG03

Recently UPDATED with Version 1B Firmware

The DG03 is a feature rich three gas nitrox Dive Computer (each of the three gases may be defined as Air, Nitrox, or 02 up to 100%) which also includes modes for use as a Digital Gauge and Free Diving. Manufactured excusively for Dive Gear Express by Hollis, the DG03 offers an excellent easy-to-read LCD display with backlight. The DG03 provides information on no-decompression and decompression times, nitrogen and oxygen absorbtion and elimination during all dive phases. It allows you to switch between three different breathing gas mixtures during the dive, enabling accelerated decompression. As a Nitrox decompression computer the DG03 uses an algorithm based on Bühlmann ZH-L16c with modification to support deep stops.

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A Battery Warning Means You Are Diving On Borrowed Time!

The nature of the lithium chemistry batteries used to power virtually all dive computers and digital bottom timers on the market has important consequences to battery life and in particular to battery warnings. That is because while lithium chemistry batteries have a very long life, it is extremely difficult to detect when they are nearing end-of-life. Lithium batteries often change from delivering full power to nearly dead in a very short time. Detecting the end-of-life is made even more unpredictable in dive computers, because they draw very little power at the surface but the power requirement increases significantly when diving.

In our experience many different brands and models of dive computers and digital bottom timers, without warning, become very erratic as a result of reaching near end-of-life on the battery. Sometimes an instrument will issue a battery warning during the dive, but on the surface after the dive the battery warning may clear. Sometimes, the first symptom instead of a battery warning might be an inaccurate depth reading which will result in inaccurate decompression times or other bizarre readings. Just to be clear, this problem is associated with the battery chemistry, not the instrument, and is true regardless of the brand name.

  • Learn what the battery warning indication is for your dive computer or digital bottom timer.
  • Never begin a dive with an instrument showing a battery warning.
  • Always have a backup should your primary instrument fail, either a second computer or a bottom timer and tables.
  • If you notice a battery warning during the dive, do NOT trust the instrument accuracy, switch to your backup solution.
  • Best practice is to occasionally compare the primary instrument to the backup, in case there is no battery warning.
  • Change the battery at the minimum factory recommended interval for your brand and model, regardless of number of dives.
  • Our recommendation is to change the 'coin' type lithium batteries annually.
Don't have a backup depth and time solution? The DG03 is a reliable backup solution that is also affordable.